<template>
  <view>
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧的滚动试图区域 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh +'px'}" >
        <block v-for="(item,i) in cateList" :key='i'>
          <view :class="['left-scroll-view-item',i=== active ? 'active' : '']" @click="activeChange(i)">{{item.cat_name}}</view>
        </block> 
      </scroll-view>
      <!-- 右侧滑动区域 -->
      <scroll-view scroll-y="true" :style="{height: wh +'px'}" :scroll-top="scrollTop">
        <view v-for="(item,i) in cateLevel2" :key='i'>
           <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
              <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
              <view class="cate-lv3-list">
                    <!-- 三级分类 Item 项 -->
                    <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
                      <!-- 图片 -->
                      <image :src="item3.cat_icon"></image>
                      <!-- 文本 -->
                      <text>{{item3.cat_name}}</text>
                    </view>
                  </view>
            </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  // 导入自己封装的 mixin 模块
  import badgeMix from '@/mixins/tabbar-badge.js'
  import { mapState, mapMutations } from 'vuex'
  export default {
    // 将 badgeMix 混入到当前的页面中进行使用
    mixins: [badgeMix],
    computed: {
        ...mapState('m_cart', ['cart']),
      },
    data() {
      return {
        wh:0,
        cateList:[],
        cateLevel2:[],
        active:0,
        scrollTop:0
      };
    },
    onLoad() {
        const sysInfo = uni.getSystemInfoSync()
        // 可用高度 = 屏幕高度 - navigationBar高度 - tabBar高度 - 自定义的search组件高度
        this.wh = sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods:{
      async getCateList(){
        const { data:res } = await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status!==200)return uni.$showMsg()
        this.cateList = res.message
        this.cateLevel2 = res.message[0].children
      },
      activeChange(i){
        this.active = i
        this.cateLevel2 = this.cateList[i].children
        this.scrollTop = this.scrollTop ? 0 : 1
      },
      gotoGoodsList(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  .left-scroll-view{
    width: 120px;
    .left-scroll-view-item{
      background-color: #F7F7F7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      &.active{
        background-color: #fff;
        position: relative;
        &::before{
          content: '';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #C00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
  }
}
.cate-lv2-title {
      font-size: 12px;
      font-weight: bold;
      text-align: center;
      padding: 15px 0;
    }
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;

  .cate-lv3-item {
    width: 33.33%;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;

    image {
      width: 60px;
      height: 60px;
    }

    text {
      font-size: 12px;
    }
  }
}
</style>
